tftp - Man Page

• Connect to a TFTP server with an interactive shell, specifying its IP address and port: tftp server_ip port
• Connect to a TFTP server and execute a TFTP [c]ommand: tftp server_ip -c command
• Connect to a TFTP server using IPv6 and force originating port to be in [R]ange: tftp server_ip -6 -R port:port
• [Interactive] Set the transfer mode to binary or ASCII through the tftp client: mode binary|ascii
• [Interactive] Download file from a server through the tftp client: get file
• [Interactive] Upload file to a server through the tftp client: put file
• [Interactive] Exit the tftp client: quit

tldr.sh

tftp [ options... ] [host [port]] [-c command]

tftp is a client for the Trivial file Transfer Protocol, which can be used to transfer files to and from remote machines, including some very minimalistic, usually embedded, systems.  The remote host may be specified on the command line, in which case tftp uses host as the default host for future transfers (see the connect command below.)

-4,  --ipv4

Connect with IPv4 only, even if IPv6 support was compiled in.

-6,  --ipv6

Connect with IPv6 only, if compiled in.

-c,  --command command

Execute command as if it had been entered on the tftp prompt. Must be specified last on the command line.

-l,  --literal

Default to literal mode. Used to avoid special processing of “:” in a file name.

-m,  --mode mode

Set the default transfer mode to mode. mode can be either netascii (convert line endings) or octet (direct binary transfer without any conversions.)

This is usually used with -c.

-a,  --ascii,  --netascii,  --text

Equivalent to --mode netascii.

-b,  --binary,  --octet

Equivalent to --mode octet.

-B,  --blocksize block-size

Request the RFC 2348 blksize option.  This requests data blocks up to block-size bytes; valid values are 8 through 65464.  The default does not request the option.

-W,  -w,  --windowsize window-size

Request the RFC 7440 windowsize option.  This permits up to window-size data blocks to be sent before an acknowledgment is required.  Valid values are 1 through 32768.  The default does not request the option.

-R,  --port-range min-port:max-port

Force the originating (local) port number to be in the specified range of port numbers.

-v,  --verbose[=level]

Default to verbose mode. At level 2 or higher, do not round byte counts in statistics or use suffixes.

-V,  --version

Print the version number and configuration to standard output, then exit gracefully.

-h,  --help

Print a usage summary and exit.

Once tftp is running, it issues the prompt tftp> and recognizes the following commands:

? command-name...

help command-name...

Print help information

ascii

Shorthand for mode ascii.

binary

Shorthand for mode binary.

connect host [port]

Set the host (and optionally port) for transfers.  Note that the TFTP protocol, unlike the FTP protocol, does not maintain connections between transfers; thus, the connect command does not actually create a connection, but merely remembers what host is to be used for transfers.  You do not have to use the connect command; the remote host can be specified as part of the get or put commands.

get file

get remotefile localfile

get file1 file2 file3...

Get a file or set of files from the specified sources.  A remote filename can be in one of two forms: a plain filename on the remote host, if the host has already been specified, or a string of the form host:filename to specify both a host and filename at the same time.  If the latter form is used, the last hostname specified becomes the default for future transfers.  Enable literal mode to prevent special treatment of the ':' character (e.g. C:\dir\file).

literal

Toggle literal mode.  When set, this mode prevents special treatment of ':' in filenames.

mode transfer-mode

Specify the mode for transfers; transfer-mode may be one of ascii (or netascii) or binary (or octet.) The default is ascii.

blocksize block-size

Request the RFC 2348 blksize option with block-size bytes per data block. Valid values are 8 through 65464.

put file

put localfile remotefile

put file1 file2 file3... remote-directory

Put a file or set of files to the specified remote file or directory. The destination can be in one of two forms: a filename on the remote host, if the host has already been specified, or a string of the form host:filename to specify both a host and filename at the same time.  If the latter form is used, the hostname specified becomes the default for future transfers.  If the remote-directory form is used, the remote host is assumed to be a UNIX system or another system using / as directory separator.  Enable literal mode to prevent special treatment of the ':' character (e.g. C:\dir\file).

quit

Exit tftp. End-of-file will also exit.

rexmt retransmission-timeout

Set the initial per-packet retransmission timeout, in seconds.  Each subsequent retry doubles this interval.

status

Show current status.

timeout total-transmission-timeout

Set the maximum retransmission interval, in seconds.

windowsize window-size

Request the RFC 7440 windowsize option with window-size data blocks per window. Valid values are 1 through 32768.

trace

Toggle packet tracing (a debugging feature.)

verbose

Toggle verbose mode.

The TFTP protocol provides no provisions for authentication or security.  Therefore, the remote server will probably implement some kinds of access restriction or firewalling.  These access restrictions are likely to be site- and server-specific.

This version of tftp is maintained by H. Peter Anvin <hpa@zytor.com>.  It was derived from, but has substantially diverged from, an OpenBSD source base, with added patches by Markus Gutschke and Gero Kulhman.

tftpd(8).

in.tftpd(8), ncftp(1), ncftpget(1), ncftpls(1), ncftpput(1).